rs and rsf test
fix
rm rs client
add io
export bucket name key name to env
add fop
add docs dir
Merge pull request #5 from rwifeng/rs_test

rs and rsf test
todo: rsf, rs.batch, resumable.io.put
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Merge pull request #7 from xushiwei/feature/v6

todo: rsf, rs.batch, resumable.io.put
add rs_utils.php
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bugfix: crc32
Merge pull request #8 from xushiwei/feature/v6

add rs_utils.php